[PATCH] soundwire: intel: Initialize clock stop timeout

[Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>]

From: Sjoerd Simons <sjoerd@collabora.com>

commit 13c30a755847c7e804e1bf755e66e3ff7b7f9367 upstream

The bus->clk_stop_timeout member is only initialized to a non-zero value
during the codec driver probe. This can lead to corner cases where this
value remains pegged at zero when the bus suspends, which results in an
endless loop in sdw_bus_wait_for_clk_prep_deprep().

Corner cases include configurations with no codecs described in the
firmware, or delays in probing codec drivers.

Initializing the default timeout to the smallest non-zero value avoid this
problem and allows for the existing logic to be preserved: the
bus->clk_stop_timeout is set as the maximum required by all codecs
connected on the bus.

Fixes: 1f2dcf3a154ac ("soundwire: intel: set dev_num_ida_min")
Signed-off-by: Sjoerd Simons <sjoerd@collabora.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Chao Song <chao.song@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20221020015624.1703950-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---

This should be applied to all stable kernels between 5.13.x and
6.0.x. Backporting to avoid a conflict with 1f2dcf3a154ac ("soundwire:
intel: set dev_num_ida_min") already added for 6.1


 drivers/soundwire/intel.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
index af6c1a93372d9..002bc26b525e8 100644
--- a/drivers/soundwire/intel.c
+++ b/drivers/soundwire/intel.c
@@ -1307,6 +1307,7 @@ static int intel_link_probe(struct auxiliary_device *auxdev,
 	cdns->msg_count = 0;
 
 	bus->link_id = auxdev->id;
+	bus->clk_stop_timeout = 1;
 
 	sdw_cdns_probe(cdns);
 
-- 
2.34.1